package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;

    @Autowired
    private DishFlavorMapper dishFlavorMapper;

    @Autowired
    private SetmealDishMapper setmealDishMapper;

    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应的口味
     * @param dishDTO
     */
    @Override
    @Transactional  // 事务注解
    public void saveWithFlavor(DishDTO dishDTO) {

        // 向菜品表插入(一条)数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        // 获取insert语句生成的主键值
        Long dishId = dish.getId();

        // 向口味表插入(n条)数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {     // dishId赋值
                flavor.setDishId(dishId);
            });
            // 批量插入
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);

        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 菜品批量删除
     * @param ids
     */
    @Override
    @Transactional  // 事务注解 保证数据操作一致
    public void deleteBatch(List<Long> ids) {
        // 判断菜品是否能够删除
        // 判断是否存在起售中的菜品
        for (Long id : ids) {
            // 根据 id 查询菜品是否在起售中
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus().equals(StatusConstant.ENABLE)) {
                // 当前菜品处于起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断当前菜品是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 当前菜品被套餐关联了 不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        /*
        for (Long id : ids) {
            // 删除菜品表中的菜品数据
            dishMapper.deleteById(id);

            // 删除菜品关联的口味数据
            // 不进行查询是否具体关联
            // 进行删除
            dishFlavorMapper.deleteByDishId(id);
        }
        */

        // 进行删除优化
        // 根据菜品id集合批量删除菜品数量
        dishMapper.deleteByIds(ids);

        // 根据菜品id集合批量删除关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);

    }

    /**
     * 根据id查询菜品和对应的口味数据
     * @param id
     * @return DishVO
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 1、根据 id 查询菜品数据
        Dish dish = dishMapper.getById(id);

        // 2、根据 菜品id 查询对应口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);

        // 3、根据查询到的数据封装到 DishVO
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(dishFlavors);

        return dishVO;
    }

    /**
     * 根据id修改菜品基本信息 和 对应口味信息
     * @param dishDTO
     */
    @Override
    @Transactional      // 事务注解
    public void updateWithFlavor(DishDTO dishDTO) {
        // 1、修改菜品表基本信息
        Dish dish = new Dish();
        Long dishId = dishDTO.getId();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        // 2、删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishId);

        // 3、重新插入口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
        }
        dishFlavorMapper.insertBatch(flavors);

    }

    /**
     * 菜品起售、停售
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {

        // 1、修改菜品状态
        Dish dish = Dish.builder()
                .status(status)
                .id(id)
                .build();
        dishMapper.update(dish);

        // 2、如若菜品为停售 且关联了 套餐 则套餐同时停售
        if (status.equals(StatusConstant.DISABLE))    // 说明为菜品停售
            return ;

        // 2.1、根据菜品 id 查询 是否 关联了套餐
        List<Long> dishIds = new ArrayList<>();
        dishIds.add(id);
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
        if (setmealIds != null && setmealIds.size() > 0) {
            // 说明菜品关联了套餐 需要对套餐进行停售
            setmealIds.forEach(setmealId -> {
                Setmeal setmeal = Setmeal.builder()
                        .id(setmealId)
                        .status(status)
                        .build();
                setmealMapper.update(setmeal);
            });
        }

    }

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId, String name) {
        return dishMapper.list(categoryId, name);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish.getCategoryId(), dish.getName());

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
